Windows Explorer has handy forward and back buttons for navigating folder history, but you can do it much faster with a keyboard shortcut: Alt+Left and Alt+Right.

This is really handy if you're jumping back and forth between folders. Holding Alt and pressing the left arrow key will move you backward in your Explorer history, and right will move you forward. It's a good shortcut to add to your hotkey repertoire. Hit the link below for a few other handy ones.